(a + b - c)² = 45?

a^{2} + b^{2} + c^{2} - 2 a b - 2 b c - 2 c a

a^{2} + b^{2} + c^{2} + 2 a b - 2 b c - 2 c a

a^{2} + b^{2} - c^{2} + 2 a b - 2 b c + 2 c a

a^{2} + b^{2} - c^{2} + 2 a b - 2 b c - 2 c a

সঠিক উত্তরঃ B.

a^{2} + b^{2} + c^{2} + 2 a b - 2 b c - 2 c a

Explanation:

(a + b - c)2 = 45?